Far-infrared high-emission natural ceramics. Thanks to the far-infrared effect, your body will be warmed even in low-temperature water, allowing you to enjoy the effects of natural stones that have been used for ages. Use by submerging in the bathtub. Remove the stones about twice a month, wash them, and dry them in the sunlight for repeated use. ◯ Comes in a wooden box, 1 box ◯ Stones, small to medium size, approximately 1kg (stone sizes vary) ◯ Wooden box size: 24cm x 17cm x 5.6cm Stored indoors for a while. Instruction manual is not included. (The wooden box has no gloss) The appearance has some scratches, but the condition is good. (Some boxes have more dirt than the photos show) We appreciate your understanding and purchase.